When performing acid pickling on steel pipes, industrial-grade hydrochloric acid is typically used directly to achieve faster pickling rates. During the process, the iron matrix in the steel pipe reacts with hydrochloric acid to form ferric chloride and ferrous chloride. As ferric chloride acts as a corrosion accelerator, adding a measured amount of used hydrochloric acid to fresh solution can effectively enhance pickling efficiency.
34. What is the effect of ferric chloride (and ferrous chloride) content in hydrochloric acid pickling solution on pickling?
Dec 15, 2025
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